Year	Percent
1991	9.24
1992	9.492
1993	9.442
1994	9.724
1995	9.742
1996	9.884
1997	10.091
1998	9.711
1999	9.883
2000	10.069
2001	9.79
2002	9.916
2003	10.001
2004	10.157
2005	10.401
2006	10.295
2007	10.302
2008	10.429
2009	10.899
2010	10.943
2011	11.083
2012	11.336
2013	11.621
2014	11.453
2015	11.294
2016	11.343
2017	11.499
2018	11.606
2019	11.698
2020	11.813
2021	11.887
2022	11.965